One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,14)(12,16)(13,15)(17,18,22,26,21,23,19,24)(20,28,30,31,29,25,27,32)(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,15,16)(18,23)(20,29)(24,26)(27,30)(2,6)(5,7)(9,12,13,11)(10,14,15,16)(17,19,21,22)(18,24,23,26)(20,30,29,27)(25,32,28,31)(3,8)(5,7)(20,29)(25,28)(27,30)(31,32) involution — undirected(2,6)(5,7)(17,20,22,30,21,29,19,27)(18,25,26,32,23,28,24,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.